export default {
	namespaced: true,
	state: () => ({
		//
		//每个商品的信息对象都包含以下6个属性
		//{'goods_id','goods_name',goods_price,'goods_count','goods_small_logo','goods_state' }
		cart:JSON.parse(uni.getStorageSync('cart') || '[]')
	}),
	mutations: {
		addToCart(state,goods){
			const findResult= state.cart.find(x => x.goods_id ===goods.goods_id)
			// console.log(findResult)
			
			if(!findResult){
				state.cart.push(goods)
			}else{
				findResult.goods_count++
			}
			// console.log(state.cart)
			// 数据都储存在本地
			this.commit('m_cart/saveToStorage')
			
			
			
		},
		
		saveToStorage(state) {
		   uni.setStorageSync('cart', JSON.stringify(state.cart))
		},
		// 更新购物车中商品的勾选状态
		updateGoodsState(state,goods){
			const findResult = state.cart.find(x =>x.goods_id === goods.goods_id)
			if(findResult){
				findResult.goods_state = goods.goods_state 
				
				// 把数据存储到本地
				this.commit('m_cart/saveToStorage')
			}
		},
		updateGoodsCount(state,goods){
			const findResult = state.cart.find(x=>x.goods_id ===goods.goods_id )
			if(findResult){
				findResult.goods_count =goods.goods_count 
				
				// 把数据存储到本地
				this.commit('m_cart/saveToStorage')
			}
		},
		// 根据商品id删除商品
		removeGoodsById(state,goods_id){
			state.cart = state.cart.filter(x=>x.goods_id !== goods_id)
			this.commit('m_cart/saveToStorage')
		},
		// 更新购物车中所有商品的勾选状态
		updateAllGoodsState(state,newState){
			state.cart.forEach(x=>x.goods_state =newState)
			
			this.commit('m_cart/saveToStorage')
		}

		
	},

	getters	: {
		// 购物车中所有商品的总数量
		total(state){
			// let c = 0
			// state.cart.forEach(x => c+=x.goods_count)
			// return c
			return state.cart.reduce((total,item) =>total +=item.goods_count,0)
		},
		// 购物车已勾选的商品总数量
		checkedCount(state){
			return state.cart.filter(x => x.goods_state).reduce((total,item) => total += item.goods_count,0)
		},
		// 已勾选商品总价   item.goods_count * item.goods_price商品数量乘已单价
		checkedGoodsAmount(state){
			return state.cart.filter(x => x.goods_state).reduce((total,item) => total += item.goods_count * item.goods_price,0).toFixed(2)
		}
		
	},
	
}